Depends on their reason. For terminal patients who don't want to suffer, I don't judge them. Also calling someone "stupid" is kind of rude, you might mean "unthinking."
Well, technically, since they don't have the ability to know or think due to fatal actions.
dead people aren't dumb though
I also believe that dead people still "think" because their soul still exists
Actually, if they commit suicide, they are DEAD!